Add Ubuntu 18.04 Base Image (#10606)

* Add Ubuntu 18.04 Base Image

Adding 18.04 Base Image to the Drop down for "Gallery"

* Updated the patch version in task.json

* upped patch number.

Tasks/PackerBuildV1/task.json

@@ -15,7 +15,7 @@
     "version": {
         "Major": 1,
         "Minor": 0,
-        "Patch": 14
+        "Patch": 15
     },
     "demands": [],
     "minimumAgentVersion": "2.0.0",
@@ -155,6 +155,7 @@
                 "MicrosoftWindowsServer:WindowsServer:2008-R2-SP1:windows": "Windows 2008-R2-SP1",
                 "Canonical:UbuntuServer:14.04.4-LTS:linux": "Ubuntu 14.04.4-LTS",
                 "Canonical:UbuntuServer:16.04-LTS:linux": "Ubuntu 16.04-LTS",
+                "Canonical:UbuntuServer:18.04-LTS:linux": "Ubuntu 18.04-LTS",
                 "RedHat:RHEL:7.2:linux": "RHEL 7.2",
                 "RedHat:RHEL:6.8:linux": "RHEL 6.8",
                 "OpenLogic:CentOS:7.2:linux": "CentOS 7.2",
@@ -349,4 +350,4 @@
         "CreateManagedImageNotSupportedForVHDSource": "Creating managed image from a source VHD is not supported. You must set 'Base image source' input value to 'Gallery'.",
         "ExpiredServicePrincipal": "Could not fetch access token for Azure. Verify if the Service Principal used is valid and not expired."
     }
-}
+}

Tasks/PackerBuildV1/task.loc.json

@@ -15,7 +15,7 @@
   "version": {
     "Major": 1,
     "Minor": 0,
-    "Patch": 14
+    "Patch": 15
   },
   "demands": [],
   "minimumAgentVersion": "2.0.0",
@@ -155,6 +155,7 @@
         "MicrosoftWindowsServer:WindowsServer:2008-R2-SP1:windows": "Windows 2008-R2-SP1",
         "Canonical:UbuntuServer:14.04.4-LTS:linux": "Ubuntu 14.04.4-LTS",
         "Canonical:UbuntuServer:16.04-LTS:linux": "Ubuntu 16.04-LTS",
+        "Canonical:UbuntuServer:18.04-LTS:linux": "Ubuntu 18.04-LTS",
         "RedHat:RHEL:7.2:linux": "RHEL 7.2",
         "RedHat:RHEL:6.8:linux": "RHEL 6.8",
         "OpenLogic:CentOS:7.2:linux": "CentOS 7.2",